Help me pack for the Baltics in late July/early August

Hello! My trip is all booked, but I'm looking for help on how to pack. Usually i garner my inspo from [r/heronebag](r/heronebag) (although I'm more of a 1.5 myself), but i literally couldn't find any packing lists or trip reports there.

Of course i know my own essentials and how to downsize toiletries etc, but I'm looking for advice on fabric types for this region, layering and what to expect weather-wise. Also, if there's any clothing that would be considered culturally in appropriate (for example, short skirts in Japan)

For those interested, here's my itinerary
2 nights in Vilnius
2 nights in Riga
3 nights in Tallinn
1 night in laheema forest
1 night in võru region for a smoke sauna ritual
2 nights in Jūrmala to rest before heading home